Public bug reported:
When building android-platform-art with clang 20 the call to 'FillVRegs'
is ambiguous. See the following error message:
runtime/art_method-inl.h:173:3: error: call to 'FillVRegs' is ambiguous
173 | FillVRegs<ArgType...>(vregs.data(), args...);
| ^~~~~~~~~~~~~~~~~~~~~
runtime/art_method-inl.h:200:24: note: in instantiation of function template
specialization 'art::detail::MaterializeVRegs<'L', 'L'>' requested here
200 | auto vregs = detail::MaterializeVRegs<'L', ArgType...>(receiver,
args...);
| ^
runtime/art_method-inl.h:229:25: note: in instantiation of function template
specialization 'art::ArtMethod::InvokeInstance<'L', 'L'>' requested here
229 | return target_method->InvokeInstance<ReturnType, ArgType...>(self,
receiver, args...);
| ^
runtime/class_linker.cc:3241:64: note: in instantiation of function template
specialization 'art::ArtMethod::InvokeVirtual<'L', 'L'>' requested here
3241 |
WellKnownClasses::java_lang_ClassLoader_loadClass->InvokeVirtual<'L', 'L'>(
| ^
runtime/art_method-inl.h:155:27: note: candidate function [with ArgType = <'L',
'L'>]
155 | inline ALWAYS_INLINE void FillVRegs(uint32_t* vregs ATTRIBUTE_UNUSED,
| ^
runtime/art_method-inl.h:160:27: note: candidate function [with FirstArgType =
'L', ArgType = <'L'>]
160 | inline ALWAYS_INLINE void FillVRegs(uint32_t* vregs,
|
I already have a patch for this: that seems to work:
--- a/runtime/art_method-inl.h
+++ b/runtime/art_method-inl.h
@@ -151,7 +151,7 @@
return sum;
}
-template <char... ArgType>
+template <char... ArgType, std::enable_if_t<sizeof...(ArgType) == 0, int> = 0>
inline ALWAYS_INLINE void FillVRegs(uint32_t* vregs ATTRIBUTE_UNUSED,
typename ShortyTraits<ArgType>::Type...
args ATTRIBUTE_UNUSED)
REQUIRES_SHARED(Locks::mutator_lock_) {}
** Affects: android-platform-art (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2098147
Title:
call to 'FillVRegs' is ambiguous
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